Roles of manganese oxides in degradation of phenol under UV-Vis irradiation:Adsorption,oxidation,and photocatalysis

作     者：Qin Zhang Xiaodi Cheng Chen Zheng Xionghan Feng Guohong Qiu Wenfeng Tan Fan Liu 

作者机构：Key Laboratory of Subtropical Agriculture and Environment Ministry of Agriculture College of Resources ＆ Environment Huazhong Agricultural University Wuhan 430070 China College of Land Resource and Environment Jiangxi Agricultural University Nanchang 330045 China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2011年第23卷第11期

页      面：1904-1910页

核心收录：

学科分类：083002[工学-环境工程] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 070301[理学-无机化学] 

基　　金：supported by the National Natural Sci-ence Foundation of China(No.40830527,40771102) the New Century Excellent Talents in University of China(No.NCET-09-0399) 

主　　题：manganese oxides adsorption oxidation photocatalysis degradation phenol 

摘      要：Manganese oxides are known as one type of semiconductors,but their photocatalysis characteristics have not been deeply *** this study,photocatalytic degradation of phenol using several synthesized manganese oxides,i.e,acidic birnessite （BIR-H）,alkaline birnessite （BIR-OH）,cryptomelane （CRY） and todorokite （TOD）,were comparatively *** elucidate phenol degradation mechanisms,X-ray diffraction （XRD）,ICP-AES （inductively coupled plasma-atomic emission spectroscopy）,TEM （transmission electronic microscope）,N 2 physisorption at 77 K and UV-visible diffuse reflectance spectroscopy （UV-Vis DRS） were employed to characterize the structural,compositional,morphological,specific surface area and optical absorption properties of the manganese *** 12 hr of UV-Vis irradiation,the total organic carbon （TOC） removal rate reached 62.1%,43.1%,25.4%,and 22.5% for cryptomelane,acidic birnessite,todorokite and alkaline birnessite,*** to the reactions in the dark condition,UV- Vis exposure improved the TOC removal rates by 55.8%,31.9%,23.4% and 17.9%.This suggests a weak ability of manganese oxides to degrade phenol in the dark condition,while UV-Vis light irradiation could significantly enhance phenol *** manganese minerals exhibited photocatalytic activities in the order of：CRY BIR-H TOD *** may be three possible mechanisms for photochemical degradation：（1） direct photolysis of phenol;（2） direct oxidation of phenol by manganese oxides;（3） photocatalytic oxidation of phenol by manganese *** oxidation of phenol appeared to be the dominant mechanism.